If you have changed your configuration, delete your Swarm config cache to rebuild it, see Swarm config cache file delete. If this API does not work, you will need to manually remove the config cache file with the command:
rm -f /opt/perforce/swarm/data/cache/module-config-cache.php
Be aware, if your Helix Server is running at security level 3 or above, you must use a valid long lived ticket instead of a password Swarm configuration file password.
If your ticket has expired, obtain a new ticket by using the following command on your Swarm instance:
p4 login -p
If this is a new Swarm install, please see the links below and ensure you have configured Swarm correctly. Install and upgrade Swarm documentation; in particular:
If this does not solve your Swarm issue, contact Support Perforce Support portal.